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#pragma once
#include <mbgl/style/conversion.hpp>
#include <mbgl/style/conversion/coordinate.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/conversion/geojson_options.hpp>
#include <mbgl/style/conversion/tileset.hpp>
#include <mbgl/style/source.hpp>
#include <mbgl/style/sources/geojson_source.hpp>
#include <mbgl/style/sources/raster_source.hpp>
#include <mbgl/style/sources/vector_source.hpp>
#include <mbgl/style/sources/image_source.hpp>
#include <mbgl/util/geo.hpp>
namespace mbgl {
namespace style {
namespace conversion {
template <>
struct Converter<std::unique_ptr<Source>> {
public:
template <class V>
optional<std::unique_ptr<Source>> operator()(const V& value, Error& error, const std::string& id) const {
if (!isObject(value)) {
error = { "source must be an object" };
return {};
}
auto typeValue = objectMember(value, "type");
if (!typeValue) {
error = { "source must have a type" };
return {};
}
optional<std::string> type = toString(*typeValue);
if (!type) {
error = { "source type must be a string" };
return {};
}
if (*type == "raster") {
return convertRasterSource(id, value, error);
} else if (*type == "vector") {
return convertVectorSource(id, value, error);
} else if (*type == "geojson") {
return convertGeoJSONSource(id, value, error);
} else if (*type == "image") {
return convertImageSource(id, value, error);
} else {
error = { "invalid source type" };
return {};
}
}
private:
// A tile source can either specify a URL to TileJSON, or inline TileJSON.
template <class V>
optional<variant<std::string, Tileset>> convertURLOrTileset(const V& value, Error& error) const {
auto urlVal = objectMember(value, "url");
if (!urlVal) {
optional<Tileset> tileset = convert<Tileset>(value, error);
if (!tileset) {
return {};
}
return { *tileset };
}
optional<std::string> url = toString(*urlVal);
if (!url) {
error = { "source url must be a string" };
return {};
}
return { *url };
}
template <class V>
optional<std::unique_ptr<Source>> convertRasterSource(const std::string& id,
const V& value,
Error& error) const {
optional<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value, error);
if (!urlOrTileset) {
return {};
}
uint16_t tileSize = util::tileSize;
auto tileSizeValue = objectMember(value, "tileSize");
if (tileSizeValue) {
optional<float> size = toNumber(*tileSizeValue);
if (!size || *size < 0 || *size > std::numeric_limits<uint16_t>::max()) {
error = { "invalid tileSize" };
return {};
}
tileSize = *size;
}
return { std::make_unique<RasterSource>(id, std::move(*urlOrTileset), tileSize) };
}
template <class V>
optional<std::unique_ptr<Source>> convertVectorSource(const std::string& id,
const V& value,
Error& error) const {
optional<variant<std::string, Tileset>> urlOrTileset = convertURLOrTileset(value, error);
if (!urlOrTileset) {
return {};
}
return { std::make_unique<VectorSource>(id, std::move(*urlOrTileset)) };
}
template <class V>
optional<std::unique_ptr<Source>> convertGeoJSONSource(const std::string& id,
const V& value,
Error& error) const {
auto dataValue = objectMember(value, "data");
if (!dataValue) {
error = { "GeoJSON source must have a data value" };
return {};
}
optional<GeoJSONOptions> options = convert<GeoJSONOptions>(value, error);
if (!options) {
return {};
}
auto result = std::make_unique<GeoJSONSource>(id, *options);
if (isObject(*dataValue)) {
optional<GeoJSON> geoJSON = convert<GeoJSON>(*dataValue, error);
if (!geoJSON) {
return {};
}
result->setGeoJSON(std::move(*geoJSON));
} else if (toString(*dataValue)) {
result->setURL(*toString(*dataValue));
} else {
error = { "GeoJSON data must be a URL or an object" };
return {};
}
return { std::move(result) };
}
template <class V>
optional<std::unique_ptr<Source>> convertImageSource(const std::string& id,
const V& value,
Error& error) const {
auto urlValue = objectMember(value, "url");
if (!urlValue) {
error = { "Image source must have a url value" };
return {};
}
auto urlString = toString(*urlValue);
if (!urlString) {
error = { "Image url must be a URL string" };
return {};
}
auto coordinatesValue = objectMember(value, "coordinates");
if (!coordinatesValue) {
error = { "Image source must have a coordinates values" };
return {};
}
if (!isArray(*coordinatesValue) || arrayLength(*coordinatesValue) != 4) {
error = { "Image coordinates must be an array of four longitude latitude pairs" };
return {};
}
std::vector<LatLng> coordinates;
coordinates.reserve(4);
for( std::size_t i=0; i < arrayLength(*coordinatesValue); i++) {
auto latLng = conversion::convert<LatLng>(arrayMember(*coordinatesValue,i), error);
if (!latLng) {
return {};
}
coordinates.push_back(*latLng);
}
auto result = std::make_unique<ImageSource>(id, coordinates);
result->setURL(*urlString);
return { std::move(result) };
}
};
} // namespace conversion
} // namespace style
} // namespace mbgl
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